Draftsman&#39;s appliance.



A. W. McCUAIG da I. N. CHIDA.

DRAFTS-MAN'S APPLIANCE.

APPLICATION @un MAY 24. 191e.

Patented Jan. 23, 1917.

nnrrnn sTATEs PATENT OFFICE.

ANTHONY W. MCCUAIG AND TONY N. CHIBA, OF LOS ANGELES, CALIFORNIA.

DRFTSMN 4APPLIANCIEI.

Application ledlMay 24, 1916.

To all whom t may concern.'

Be it known that we, As'rnoxv W. Md'

(lnAIG, o citizen ofthe United States of America, und Toni' N. Curon, a subject oi the Emperor of J span, both residing et Los Angeles, in the county of Los Angeles nud Stute ot' Californie, have invented certain new and useful Improvements in IDraftsinens l'vxmiliunces, and do hereby declare that the iollmi'ing a full, clem', and exact description of the sinne, reference being had to the uccomininying drawings, which together with the ligurcs of relie-rence marked thereon form a purt oi this specification.

The seid description and drawings illustra'te the invention to such un extent as to enable any person skilled in thc art or science "to/which the invention appertains to make, construct and use the same.

This invention relates to certain new and useful improvements in instruments, devices j or appliances for use by drsftsmen, engineers andarchitects, being s combination of several appliances, its herbei.,

The invention has for itsfobjects, among others, to provide an improved instrument,

Ydevice or appliance of the nature stated,

which shall be reliable and accurate in its,

operation und movements, simple as regards coi'istruirtion und means for governing movements, particular reference being made to the ces with which movements of desired distanc nmy he obtained, und at the seme time providing a durable and convenient appliance, which will be positive in operation and likewise relatively inexpensive in construction and generally superior ineilicicncy.

The ruling or struigl'it-edge member is readily detachable from the bese member sind the extension and protractor arms from the :ruling member or straight-edge, thereby furnishing in r ty two triangles, u protractor and sererul scales, all of which are devices or appliances necessu ry in preparing end completing maps, plans end rlrzuvings.

We provide ineens for regulating the dis tence between parallel lines or rulings, both equi-distant from `euch other and increasing or decreasing the spacing between parallelA lines within or over a given distance or uren. We provide means for regulating the strength und rapidity of movements O'f the ruling or strziightredge member. We also provide. for the free running of the pinion wheel of the instrument, devicem' appliance, and consequently for the free move- Specification of Letters Patent.

ter set forth.

Patented Jan. 23, 1917.

sum1 No. 99,615.

power or tension upon the ruling or straightedge member, is also of novel construction, actuating the speed I.mol strength of movements olE the said ruling or straight-edge member when said tension is brought to beer upon said member by means of the operar' tionvofvthe escapement. i Other objects and advantages of the invention will hereafter appear, and the novel features thereof will be specifically defined by the appended claims.

Referring 110W to the several views or g`' ures: Figure l is a top lan-view of the complete instrument, devlce or appliance, with the protractor arm broken olf and not showing the ruling or straight-edge extension. Fig. 2 is a top plan view of ratchet wheel, the distance of movementsof the ruling or straight-edge member of the i`nstru.v ment being governedV by the number and position ofthe teeth' on the ratchet wheel in use. There will be o. variety of said wheels, but only one is shown. Fig. 3 is a top plan view of the 'rulin or-straight-edge vextension, broken oil. ig. 4 is partially e sectional vieW of the ruling or straightcdgeextension on the line 3 3,- said extension hp# peering es when attached to the ruling or straight-edge member '.of the instrument. Fig. 5 is partially va sectional View of ower spring or Vdriving drum and means o' connecting the buse member of the instrument with the ruling or straight-edge member on the line 1-1. Fig. 6 is a perspective view of the escapement dogs, dog-holder and lever. Fig. 7 is partially a.. sectienalview of the cscapement mechanism of the instrument on the line 2-4-2, also showing rack and rack cover.

Like letters of reference indicate like parts throughout the several views. l

Referring more particularly to the draw ings, the numeral 1 designates the lbase member ofthe instrument, a triangle in the accompanying drawing, but which may be of any suitable shape, substantially as shown, upon which is mounted or within which may be contained the power spring or driving drum 2, the purpose of said spring or driving drum, when connected, being to create a tension between the base member 1 and the ruling or straight-edge member 9, hereinafter described. Said spring or driving drum 2 is retained by the pin or bearing 3, upon which is also mounted or around which revolves the small ratchet wheel 4 which regulates the tension created by the spring or driving drum 2 and its connections.

Uponthe face f the base member 1 is a longitudinal bar or'rack 5. Said bar or rack being fastened to the base member 1 in any suitable manner and extends substantially the entire length thereof, parallel with the :edge and the required distance therefrom, as illustrated. Along the right-hand edge of this bar or rack is a plurality of transverse grooves or teeth for engagement with the toothed pinion 12, which pinion is hereinafte'r. described. Said baror rack is covered by a thin bar 6 which is fastened thereto in any suitable manner.

In the altitudinal edge of the base member 1 is a groove S, so shaped as to receive and permit of a sliding movement only a counterpart 10 of the straight-edge member 9, 'hereinafter described. 7 is a groove or slot within the altitudinal edge of said base member 1 and also within the opening created by reason of the groove 8. Said groove or slot 7 is to receive and permit the passage of a necessary portion of the tape extension of the power spring or driving drum 2.

The numeral 9 designates the ruling or straight-edge' member of the instrument, device or appliance, a triangle in the accompanying drawings, but which may b'e of an suitable shape, substantially as shown. Said ruling or straight edge member is connected tothe base member 1 as hereinbefore set forth. and when so connected is capable of -nism of the instrument, composed of 'a' toothed pinion 12, which engages With`the rack 5, which rack was hereinbefore described. Normally said pinion `iacapable of running freely in a reverse direction only,

br when the ruling member of the i strument is returned or moved upward or outthe pinion 12, rotates around the pin or bearing 17. To the ratchet wheel 16 are fastened in a suitable manner and position' the small dog 14 and the spring 15, hereinbefore described. Engaging with the ratchet wheel 16 are two dogs or pawls 18 and 19, which are mounted upon a dog holder or rocker 20, an extension or arm` of which forms the lever 21 having its fulcrum at 21, which lever has a return lspring 22, upon the outer end of which lever 21 is mounted the key of the instrument 23. The lever 21 is held in position by the pin or bearing 24, which acts as a fulcrum therefor. When the key 23 is depressed, the dog or pawl 19 is withdrawn from the ratchet wheel 16 and moves, normally, upward, and the dog or pawl 18 is engaged with said ratchet wheel 16. When the key is released, the dog or pawl 18 is released and the dog or pawl 19 caused to engage with the next tooth of the ratchet wheel, thus permitting the power 'spring or driving drum 2 to move the ratchet it winds the power spring or driving drum- 2. giving the necessary tension for the movementl of the said ruling or straight-edge member as a result of the operation of the escapement upon the depression and release of the key 23, as hereinbefore set forth.

The numeral 26 designates a sulHJorting block which is fastened securely an in the required position to the ruling member 9 ofl the instrument by means of a suitable number of screws similar to 27 and 28, and having a slot or opening 29 to receive the lever 21, hereinbefore described. Between two fingers or projections of the extension or arm 30 is hung a small roller 31, and between the fingers or two projections ,of the movable extension or arm 32 of the-Hook 26 is hung the small roller 33. Said .rollers'el rd 33 assist in holding the teeth pf the ratchet wheel 16 in position 'for proper engagement with the dogs or'pawls 18 and 19, and said movable extension or arm 32 is supported by or swings "on the screw or III bearing 34, and may be moved out of normal whenit is desired to change ratchet. wheels. The position or distance of the stroke or movement of the lover 21 may be regulated by the screw 36.

The numeral 37 designates the rulingr or a suitable manner to the ruling or straightedge member of the instrument at any oil. the points, holes oropenings 45, 4G or 47 hy means of the thumbscrew 44, or holes or openings mayv be made at other points and said protractor arm fastened in the desired position.

Having thus fully described our invention, what we claim and desire to secure by Letters Patent,.is:

1. In combination with two members connected for relative movement, a spring drum on one Iotisaid members, meansvconnecting said drum and the other member to cause relative movement between the members, es capement mechanismy on one member and cooperating with the other member, and means for manually operating said escapement mechanism.

2. In combination with two members connected for relative movement, a spring drum on one of said members, means connecting said drum and the other member to cause relative movement between. the members, escapement mechanism on one member and cooperating with the other member, and means for manually operating said escapement mechanism; the member lwith which saidV escapement mechanism cooperates being provided with a rack to that end.

$3. T n combination with two members connected lor the relative movement, a spring drum on one of said members` means con- A, nenti-11,2 said drum and the other member to cause relative movement between the members, eseapementmeehamsm on one member and eoperatmg wlth the other member, and

rvmeans ier manually operating said escapement mechanism; the member with which said escapement mechanism coperates being provided with a rack to that end; said escapcment mechanism comprising: an es- 4capernent wheel, and a pinion mounted to rotate with saidl escapement wheel. and, enraging with said rack: and said means for manually operating said escay'iement mechanism comprising,r spaced d adapted to be alternately applied tothe teeth of said escapement wheel,l and a member for recipro-I eating:y said dogs in a path 'substantially parallel with the axis of said eseapement Wheel.

1. In combi-nation with two members connected for relative movement, a spring drum on one of said members, means connecting said drum and the other member to cause relative movement between the members, escapement`mechanism on one member and cooperating with the other member, and means for manually operating said escapement mechai'iisln; the member withrwhieh said ,estalla-ment mechanism cooperates being' provided with a, rack to that end; said escala-meut meehal'iism comprising an es :aiiement wheel, and a pinion mounted to rotate with said cscapen'ient wheel and en-v gaging with said rack; and said means for manually operating said escapement mechanismcomprising spaced dogs adapted to be alternately applied to the teeth olE said escapement wheel. and a member 'for reeiprocatiiig said dogs in a path substantially parallel with the axis of said escapement wheel; said member for reciprocating said dogs comprising,r a depressible spring-resisted key, a dog-holder whereby the dogs are connected with the key, and means limiting the movenlel'it ol: the dogholder and dogs and key.

in combinatiim with two members connected for relative movement, a spring drum on one of said members, means connecting said drum and the other member to cause relative movement between the members, es-

fay'iement mechanism on one member and coiil'neratingz, with the other member, and means for manually operating said yescapement mechanism; the member with which said escaiien'ient mechanism `coperates be ing provided with a rack to that end; said escapement mechanism comprising an escapement wheel, and a pinion mounted te rotate with said escapement wheel and engagging with said rack; and said means for manually operating said escapement mechanism comprising spaced dogs adapted to be alternately applied to the teeth of said escapement wheel, and a member for reciproeating said dogs in a path substantially4 parallel with the axis ot said escapement wheel; said member for reciprocating said dogs comprising a depressible spring-resisted key, a dog-holder Iwhereby the dogs are connected with the key, and means limitnet-ting said drum and the other member to cause relative movement between the members. escapement mechanism on one member and coperating' with the other member, and means `for manually operating said escapement mechanisn'i; the member with which said escapemont mechanism coperates being provided with a rack to that end; said Kescapement mechanism comprisin an escapement wheel, and a pinion mounte to rotate with said escapment wheel and engaging with said rack; and said means for manually operating said escapement mech-y anism comprising spaced dogs adapted to be alternately applied to the teeth of said escapement wheel, and a member for reciprocatin ogs in a path substantial y pai-alle? with he axis of said escapement wheel; rollers being applied to both faces of said escapement wheel adjacent of reclprocation of said dogs in engagement therewith.

7. In combination with two members connected'for the relative movement, a spring drum on one of said members, means connecting said drum and the other member to cause relative movement between the members, escapement mechanism on one member andy coperating with the other member, and means for manually operating said escapement mechanism; the member with which said escapement mechanism coperates being provided with a rack to that end; said escapement mechanism comprising an escapei ment wheel, and a pinion mounted torotate vwith said escapement wheel and engaging with said rack; and said means for manually operating sald escapementrmechwnhis'm cdmtoV the zone.

prising spaced dogs adapted to be alternately applied to ment wheel, and a member for reciprocating said dogs in a path substantially parallel with the axis pf said escapement wheel, means being provided for operatively disconnecting said escapementwheel -from said pinion whereby the latter without operation of the former.

8. In combination with two members connected for the relative' movement, a spring-v drum on one of said members, means connecting said drum and the other member to cause relative movement between the members, escapement mechanism on one member and coperating with the other member, and means for .manually operating said esca ment mechanism; said members being slldably u connected', l*and the means of connectionbctween said)drum and said last mentioned member consisting of la fiexible extension of the spring drum. .i

In testimony; whereof we have hereunto lallixed our signatures in the presence of two witnesses.

ANTHONY W. MGCUAIG. TONY N. CHIDA. g itnesses: f

` W. N. HAMAER,

J. A. WAL'roN, JR.

the teeth of-said escape- 

